<!DOCTYPE html>
<html>
<head>
	<title>13 border</title>
<style>
	#test1 {
		width: 300px;
		height: 300px;
		background: gray;

		/*border: 20px宽度 样式solid实线 blue颜色;*/
		/*border: 20px inset red;*/
		border-top: 10px solid blue;
		border-right: 10px inset red;
		border-bottom: 10px solid green;
		border-left: 10px solid orange;
	}
</style>
</head>
<body>
	<div id="test1"></div>
</body>
</html>